﻿/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * Class for working with a selection range, much like the W3C DOM Range, but
 * it is not intended to be an implementation of the W3C interface.
 * (IE Implementation)
 */

FCKDomRange.prototype.MoveToSelection = function()
{
    this.Release( true ) ;

    this._Range = new FCKW3CRange( this.Window.document ) ;

    var oSel = this.Window.document.selection ;

    if ( oSel.type != 'Control' )
    {
        var eMarkerStart    = this._GetSelectionMarkerTag( true ) ;
        var eMarkerEnd        = this._GetSelectionMarkerTag( false ) ;

        if ( !eMarkerStart && !eMarkerEnd )
        {
            this._Range.setStart( this.Window.document.body, 0 ) ;
            this._UpdateElementInfo() ;
            return ;
        }

        // Set the start boundary.
        this._Range.setStart( eMarkerStart.parentNode, FCKDomTools.GetIndexOf( eMarkerStart ) ) ;
        eMarkerStart.parentNode.removeChild( eMarkerStart ) ;

        // Set the end boundary.
        this._Range.setEnd( eMarkerEnd.parentNode, FCKDomTools.GetIndexOf( eMarkerEnd ) ) ;
        eMarkerEnd.parentNode.removeChild( eMarkerEnd ) ;

        this._UpdateElementInfo() ;
    }
    else
    {
        var oControl = oSel.createRange().item(0) ;

        if ( oControl )
        {
            this._Range.setStartBefore( oControl ) ;
            this._Range.setEndAfter( oControl ) ;
            this._UpdateElementInfo() ;
        }
    }
}

FCKDomRange.prototype.Select = function( forceExpand )
{
    if ( this._Range )
        this.SelectBookmark( this.CreateBookmark( true ), forceExpand ) ;
}

// Not compatible with bookmark created with CreateBookmark2.
// The bookmark nodes will be deleted from the document.
FCKDomRange.prototype.SelectBookmark = function( bookmark, forceExpand )
{
    var bIsCollapsed = this.CheckIsCollapsed() ;
    var bIsStartMakerAlone ;
    var dummySpan ;

    // Create marker tags for the start and end boundaries.
    var eStartMarker = this.GetBookmarkNode( bookmark, true ) ;

    if ( !eStartMarker )
        return ;

    var eEndMarker ;
    if ( !bIsCollapsed )
        eEndMarker = this.GetBookmarkNode( bookmark, false ) ;

    // Create the main range which will be used for the selection.
    var oIERange = this.Window.document.body.createTextRange() ;

    // Position the range at the start boundary.
    oIERange.moveToElementText( eStartMarker ) ;
    oIERange.moveStart( 'character', 1 ) ;

    if ( eEndMarker )
    {
        // Create a tool range for the end.
        var oIERangeEnd = this.Window.document.body.createTextRange() ;

        // Position the tool range at the end.
        oIERangeEnd.moveToElementText( eEndMarker ) ;

        // Move the end boundary of the main range to match the tool range.
        oIERange.setEndPoint( 'EndToEnd', oIERangeEnd ) ;
        oIERange.moveEnd( 'character', -1 ) ;
    }
    else
    {
        bIsStartMakerAlone = ( forceExpand || !eStartMarker.previousSibling || eStartMarker.previousSibling.nodeName.toLowerCase() == 'br' ) && !eStartMarker.nextSibing ;

        // Append a temporary <span>&#65279;</span> before the selection.
        // This is needed to avoid IE destroying selections inside empty
        // inline elements, like <b></b> (#253).
        // It is also needed when placing the selection right after an inline
        // element to avoid the selection moving inside of it.
        dummySpan = this.Window.document.createElement( 'span' ) ;
        dummySpan.innerHTML = '&#65279;' ;    // Zero Width No-Break Space (U+FEFF). See #1359.
        eStartMarker.parentNode.insertBefore( dummySpan, eStartMarker ) ;

        if ( bIsStartMakerAlone )
        {
            // To expand empty blocks or line spaces after <br>, we need
            // instead to have any char, which will be later deleted using the
            // selection.
            // \ufeff = Zero Width No-Break Space (U+FEFF). See #1359.
            eStartMarker.parentNode.insertBefore( this.Window.document.createTextNode( '\ufeff' ), eStartMarker ) ;
        }
    }

    if ( !this._Range )
        this._Range = this.CreateRange() ;

    // Remove the markers (reset the position, because of the changes in the DOM tree).
    this._Range.setStartBefore( eStartMarker ) ;
    eStartMarker.parentNode.removeChild( eStartMarker ) ;

    if ( bIsCollapsed )
    {
        if ( bIsStartMakerAlone )
        {
            // Move the selection start to include the temporary &#65279;.
            oIERange.moveStart( 'character', -1 ) ;

            oIERange.select() ;

            // Remove our temporary stuff.
            this.Window.document.selection.clear() ;
        }
        else
            oIERange.select() ;

        FCKDomTools.RemoveNode( dummySpan ) ;
    }
    else
    {
        this._Range.setEndBefore( eEndMarker ) ;
        eEndMarker.parentNode.removeChild( eEndMarker ) ;
        oIERange.select() ;
    }
}

FCKDomRange.prototype._GetSelectionMarkerTag = function( toStart )
{
    var doc = this.Window.document ;
    var selection = doc.selection ;

    // Get a range for the start boundary.
    var oRange ;

    // IE may throw an "unspecified error" on some cases (it happened when
    // loading _samples/default.html), so try/catch.
    try
    {
        oRange = selection.createRange() ;
    }
    catch (e)
    {
        return null ;
    }

    // IE might take the range object to the main window instead of inside the editor iframe window.
    // This is known to happen when the editor window has not been selected before (See #933).
    // We need to avoid that.
    if ( oRange.parentElement().document != doc )
        return null ;

    oRange.collapse( toStart === true ) ;

    // Paste a marker element at the collapsed range and get it from the DOM.
    var sMarkerId = 'fck_dom_range_temp_' + (new Date()).valueOf() + '_' + Math.floor(Math.random()*1000) ;
    oRange.pasteHTML( '<span id="' + sMarkerId + '"></span>' ) ;

    return doc.getElementById( sMarkerId ) ;
}
